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Annals of Family Medicine 2:204-208 (2004)
© 2004 Annals of Family Medicine, Inc.
doi: 10.1370/afm.141
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What Is an Intracluster Correlation Coefficient? Crucial Concepts for Primary Care Researchers

Shersten Killip, MD, MPH1, Ziyad Mahfoud, PhD2 and Kevin Pearce, MD, MPH1

1 Department of Family Practice and Community Medicine, University of Kentucky, Lexington, Ky
2 Department of Statistics, University of Kentucky, Lexington, Ky



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  		Figure 1. Two-level nesting, or clustering.

 


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  		Figure 2. Three-level nesting.

 




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